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Finding the Fourth Proportional to 1,054.54, 1,455.34 and 661.50

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Solution

The fourth proportional to 1,054.54, 1,455.34 and 661.50 is: 912.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,054.54 : 1,455.34 = 661.50 : x
  2. Step 2: Convert to fraction form
    1,054.54/1,455.34 = 661.50/x
  3. Step 3: Cross multiply
    1,054.54x = 1,455.34 × 661.50
  4. Step 4: Simplify right side
    1,054.54x = 962,707.41
  5. Step 5: Solve for x
    x = 962,707.41/1,054.54
  6. Step 6: Final answer
    x = 912.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.